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~~ ~~ 1 <br />The solum is 10 to 20 inches thick. Lime is at a depth of 6 to 20 <br />inches. <br />Bt horizon: Clay content is 18 to 30 percent. The horizon is 35 to 70 <br />percent fine or coarser sand. <br />A and B horizons: The horizon is 0 to 35 percent rock fragments that <br />are predominantly 1/4 to 3 inches in diameter. <br />